October 2023 Price HIkes- Can we purchase JR pass earlier than October 2023 to be able to use it after October 2023

Hi There JR Pass :)
I am excited to come to Japan in November 2023. Recently I heard there will be a huge price increase for JR pass coming in October 2023. Thus, i was wondering if I can purchase the JR pass prior to October 2023 at the current price of $482 for 21 days and be able to activate it to use for the entirety of November 2023 without being affected by the price change? Or will the price change pause all travelers using the JR pass after October 2023 to pay the price increase difference? Just wondering if you can clarify this. Thank you so much :)
Vinh Le